Bars: Black, Blue, Green, 1959
Catalog #23
Estate of the Artist.
Columbus, Ohio, Columbus Museum of Art, Optic Nerve: Perceptual Art of the 1960s, February 16 – June 17, 2007.
Malibu, California, Seaver College Art Gallery, Pepperdine University, Karl Benjamin: Paintings From the Fifties, March 23 – April 18, 1981.
West Hollywood, California, Louis Stern Fine Arts, Karl Benjamin: Paintings from 1950-1965, January 10 – April 10, 2004.
Schipper, Merle. Karl Benjamin: Paintings from the Fifties. Pepperdine University: 1981, reproduced in color on page 15, titled Bars - Multicolored.
Nelson, Harold B., et al. Karl Benjamin: Paintings from 1950-1965. Los Angeles: Louis Stern Fine Arts, 2004, plate 26, reproduced in color on page 31.
Houston, Joe, et al. Optic Nerve: Perceptual Art of the 1960s. Columbus: Columbus Museum of Art, 2007, plate 46, reproduced in color on page 42.